Server Side Includes

Server side includes are always available, but require you to name your files with an .shtml extension.

If you want plain .html files all to be processed with server side includes you must create an .htaccess file in your web directory with the following directive in it:

AddHandler server-parsed .html

If you have a lot of web pages that do not require SSI you may find this will slow down your site as the server will have to parse every single file even if there are no SSI commands. In that case you would be better to use the .shtml extension method.